MACS 609 CERTIFICATION 100+
QUESTIONS WITH CORRECT ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what must be
done with the lubricant?
ANS>> Re-install lubricant removed by the recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C
system using recovery-only equipment?
Question 2 options:
ANS>> Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile air conditioning system?
ANS>> If shop air is used in the system in an attempt to check for leaks and HFC-134a is present
Which type of mobile A/C system will usually require additional time / precautions to extract all
the refrigerant?
ANS>> Accumulator type
,Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as
low as:
ANS>> 0.15 ounces per year
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation?
ANS>> Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed?
ANS>> To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems?
ANS>> Flushing solvents may remain in A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine, after competing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant?
ANS>> 5 minutes
Which type of tank must be used during the transfer of refrigerant?
Question 10 options:
ANS>> Tanks marked DOT 4BA
, When it has been determined that an A/C system has a low refrigerant charge, what should be
done?
ANS>> Perform a leak detection procedure
One effect of some refrigerant gases in the atmosphere is that they:
ANS>> Contribute to trapping heat
Mixing CFC-12 and HFC-134a in the same system will:
ANS>> Result in refrigerant cross contamination
How much moisture is removed from a mobile A/C system during a typical evacuation?
ANS>> Possibly none
Paid technicians who service or repair mobile A/C systems using HFC-22 as refrigerant, or
service cargo refrigeration equipment:
ANS>> Must be Section 608 Type II certified
HFO-1234yf is classified as "A2L-mildly flammable." This means:
ANS>> It can ignite under certain circumstances
Section 609 of the Clean Air Act requires that recovery/recycling equipment:
ANS>> Must be registered with the EPA
What is the advantage of using refrigerant identification equipment?
ANS>> Allows the ability to determine what type of refrigerant is in system
QUESTIONS WITH CORRECT ANSWERS
If lubricant is removed by recovery equipment during system refrigerant removal, what must be
done with the lubricant?
ANS>> Re-install lubricant removed by the recovery equipment
Before reuse, what must be done with HFC-134a that has been recovered from a mobile A/C
system using recovery-only equipment?
Question 2 options:
ANS>> Recycle the HFC-134a before reuse using certified equipment
When can HFC-134a become combustible in a mobile air conditioning system?
ANS>> If shop air is used in the system in an attempt to check for leaks and HFC-134a is present
Which type of mobile A/C system will usually require additional time / precautions to extract all
the refrigerant?
ANS>> Accumulator type
,Electronic leak detectors certified to SAE J2791 have the capacity of identifying leakage rates as
low as:
ANS>> 0.15 ounces per year
When recovery/recycling equipment is used to remove refrigerant from a mobile A/C system,
how much lubricant will be removed during the operation?
ANS>> Generally, very little, if any
Why is it necessary to insure that service port caps containing good seals are installed?
ANS>> To minimize refrigerant loss
Which of the following statements is correct about flushing A/C systems?
ANS>> Flushing solvents may remain in A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine, after competing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant?
ANS>> 5 minutes
Which type of tank must be used during the transfer of refrigerant?
Question 10 options:
ANS>> Tanks marked DOT 4BA
, When it has been determined that an A/C system has a low refrigerant charge, what should be
done?
ANS>> Perform a leak detection procedure
One effect of some refrigerant gases in the atmosphere is that they:
ANS>> Contribute to trapping heat
Mixing CFC-12 and HFC-134a in the same system will:
ANS>> Result in refrigerant cross contamination
How much moisture is removed from a mobile A/C system during a typical evacuation?
ANS>> Possibly none
Paid technicians who service or repair mobile A/C systems using HFC-22 as refrigerant, or
service cargo refrigeration equipment:
ANS>> Must be Section 608 Type II certified
HFO-1234yf is classified as "A2L-mildly flammable." This means:
ANS>> It can ignite under certain circumstances
Section 609 of the Clean Air Act requires that recovery/recycling equipment:
ANS>> Must be registered with the EPA
What is the advantage of using refrigerant identification equipment?
ANS>> Allows the ability to determine what type of refrigerant is in system
